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TA31275FN Datasheet(PDF) 7 Page - Toshiba Semiconductor

No. de pieza TA31275FN
Descripción Electrónicos  AM/FM RF/IF Detector IC for Low Power Wireless System
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Fabricante Electrónico  TOSHIBA [Toshiba Semiconductor]
Página de inicio  http://www.semicon.toshiba.co.jp/eng
Logo TOSHIBA - Toshiba Semiconductor

TA31275FN Datasheet(HTML) 7 Page - Toshiba Semiconductor

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TA31275FN/ TA31275FNG
03-01-23
7
7.
RF Amp Gain 2
RF amp gain 2 (Gv (RF) 2) is a reference value calculated as follows. Measure GRF in the following figure.
Gv (RF) 2 is calculated as follows:
Gv (RF) 2 = GRF − Gv (MIX)
Figure 4
8.
IF Amp Gain
The intended value is 75dB.
9.
Waveform-Shaping Output Duty Cycle
The specified range of electrical characteristics is only available for single-tone.
10. Local Frequency Range (after multiplying frequency by 8)
When the multiplier circuit is used, the local frequency will be in the range 250.7 MHz to 439.3 MHz.
11. Treatment of FM Terminal when Using AM
When using AM, it is not necessary to treat the QUAD pin (pin 10). Leave it open or connected to an FM
external circuit. To use the bit rate filter, connect the RSSI pin (pin 21) to the bit rate filter through a
resistor. The AF-OUT pin (pin 22) should be left open.
Figure 5
Figure 6
Using AM causes current to flow through the AM/FM pin (pin 19). Ground the AM/FM pin (pin 19) or
connect it to the BS pin (pin 9).
AF
OUT
RSSI
Bit rate filter for FM
22
21
1000 pF
4
6
18
16
13
0.01
µF
SG
50dB
µV
GRF
6 pF
1000 pF
0.01
µF
21
22
AF
OUT
RSSI
Bit rate filter for AM
36 k


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